From brunette to blonde, to candyfloss pink to turquoise, the singer is never satisfied with her chosen shade for too long, but it looks like her latest look - Smurf blue - is here to stay.

After returning to the colour when she split with Russell Brand over Christmas, Perry showed off her all-blue style as she launched her false lashes collection with Eylure in LA yesterday.

Photo: Getty Images

Katy swapped her sleek, short bob for a retro-inspired updo, with a French pleat and a victory roll fringe. Never one to do things by halves, she brought out her inner Smurfette by matching her dress and killer heels with her new do.

So was she too blue or candy-colour chic? Let us know and take a look below to see more of Perry's most memorable style moments.